14 January 2011,
Here's the latest Hawaii Five-0 spoilers about Mcgarretts love interest, Catherine, from EW.com:

Q: What will happen with McGarrett and Catherine on Hawaii Five-0? Been so anxious to see them together again.
A: I’m hearing Catherine will return in the Jan. 23 episode. And I MIGHT have a sneak peek at the H50 post-AFC game episode very soon. Just sayin’.

Labels: Alex o'Loughlin, CBS, Hawaii Five-O, Season 1, Spoiler